resolv/bits/types/res_state.h

   1 #ifndef __res_state_defined
   2 #define __res_state_defined 1
   3
   4 #include <sys/types.h>
   5 #include <netinet/in.h>
   6
   7 /* res_state: the global state used by the resolver stub.  */
   8 #define MAXNS                   3       /* max # name servers we'll track */
   9 #define MAXDFLSRCH              3       /* # default domain levels to try */
  10 #define MAXDNSRCH               6       /* max # domains in search path */
  11 #define MAXRESOLVSORT           10      /* number of net to sort on */
  12
  13 struct __res_state {
  14         int     retrans;                /* retransmission time interval */
  15         int     retry;                  /* number of times to retransmit */
  16         unsigned long options;          /* option flags - see below. */
  17         int     nscount;                /* number of name servers */
  18         struct sockaddr_in
  19                 nsaddr_list[MAXNS];     /* address of name server */
  20         unsigned short id;              /* current message id */
  21         /* 2 byte hole here.  */
  22         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
  23         char    defdname[256];          /* default domain (deprecated) */
  24         unsigned long pfcode;           /* RES_PRF_ flags - see below. */
  25         unsigned ndots:4;               /* threshold for initial abs. query */
  26         unsigned nsort:4;               /* number of elements in sort_list[] */
  27         unsigned ipv6_unavail:1;        /* connecting to IPv6 server failed */
  28         unsigned unused:23;
  29         struct {
  30                 struct in_addr  addr;
  31                 uint32_t        mask;
  32         } sort_list[MAXRESOLVSORT];
  33         /* 4 byte hole here on 64-bit architectures.  */
  34         void * __glibc_unused_qhook;
  35         void * __glibc_unused_rhook;
  36         int     res_h_errno;            /* last one set for this context */
  37         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
  38         unsigned int _flags;            /* PRIVATE: see below */
  39         /* 4 byte hole here on 64-bit architectures.  */
  40         union {
  41                 char    pad[52];        /* On an i386 this means 512b total. */
  42                 struct {
  43                         uint16_t                nscount;
  44                         uint16_t                nsmap[MAXNS];
  45                         int                     nssocks[MAXNS];
  46                         uint16_t                nscount6;
  47                         uint16_t                nsinit;
  48                         struct sockaddr_in6     *nsaddrs[MAXNS];
  49 #ifdef _LIBC
  50                         unsigned long long int __glibc_extension_index
  51                           __attribute__((packed));
  52 #else
  53                         unsigned int            __glibc_reserved[2];
  54 #endif
  55                 } _ext;
  56         } _u;
  57 };
  58
  59 typedef struct __res_state *res_state;
  60
  61 #endif /* __res_state_defined */